This is, of course, assuming GTVI/SOC ever find out about this.
That has me thinking - why would SOC need to actually find out about it? Steele just needs to say that they are. There is no one that will question that.
Could he say: "Vasudan HOL spies are working for the UEF. They're the ones who helped to prevent the ordered self-destruction of Neptune HQ and allowed it to fall into UEF hands"?
Better yet. If the UEF show the guncam from the assassination of the elder in Act 2, Steele says it was HoL agents flying Terran vessels trying to frame him and create a GTVA civil war.
Maybe they even DID do that, and manipulated some GEF's to do what they wanted - including the Ambush on the Psedjet. I'm sure this has been discussed to death prior to Act three, but I still don't think the ambush of the psedjet makes a lot of sense from Steele's perspective.
What would have happened if the Indus didn't show up? The GEF's would have captured or destroyed the Psedjet, or the Arethusa would have driven them off.
A) What's he planning to do with it? It certainly can never be seen in his hands again - the Vasudans would smell a rat. Would he just give it to them? Why give up a brand new logistics ships to a band of pirates you can just supply yourself anyays?
B) Destroy it? So what? Khonsu finds out that a gang of pirates destroyed one of his ships. It wasn't the UEF, it's unlikely to motivate the Imperium entering the war on the Tev's side. In fact, if anything, he would likely be pissed that Steele didn't properly protect the Psedjet.
C) The Arethusa arrives in time, drives off the GEF's saves the Psedjet. No UEF arrival. What does that gain Steele? A bunch of his mercenaries attack his ally's ship and a bunch of his soldiers drive off the mercenaries he is paying? Again, being attacked by bandits who the AT WAR with the UEF is unlikely to convince Khonsu that the Buntus are the bad guys here.
I can see the motive for the assassination though. That being said, I just don't see the motive or logic for the attack on the psedjet, and never really have. Now that we know about the HoL, how do we know they didn't organize that attack in order to make the UEF look GOOD? In fact, the only group that benefits from a GEF raid on the Psedjet IS the UEF. I smell a Fedayeen/HoL rat - especially since we know Captain Apries was an HoL agent.
Now to the assassination:
A) (Most likely in my opinion): Steele organized it in order to prevent an alliance or peace, this in response to the Psedjet incident, which I still don't think he planned.
B) The HoL/Fedayeen organized it in order to make it LOOK like Steele was trying to assassinate an elder in an attempt to break up the GTVA by implying that Steele has betrayed the Vasudans. It wouldn't be hard to believe that the Fedayeen has some captured Tev Hardware, and they've used GEF mercenaries as well. This kind of operation is right up their alley.
I still think A is more likely, but as a fluid response to the Psedjet incident, rather then a second step to a plan that included the Psedjet. I still don't think Steele had ANYTHING to gain from the psedjet incident. It doesn't make any sense.
Edit--
I guess what I'm saying is there may be more truth to Steele telling the Vasudan Admiral in Sol that there is a plot (to break up the alliance between the Tevs and Zods) than we maybe originally assumed.